Analysis for multi-physics coupling performance of prismatic dispersed microencapsulated fuel
High-temperature gas-cooled reactors are one of the main candidate reactors for nuclear thermal propulsion.The performance of the reactor is mainly influenced by the performance of the fuel element.There are many forms of fuel elements in high-temperature gas-cooled reactors,and high safety dispersed microencapsulated fuels have extremely high application prospects in high-temperature gas-cooled reactors.Therefore,the analysis for microencapsulated fuels for high-temperature gas-cooled reactors is needed.A prismatic dispersed microencapsulated fuel with TRISO particles dispersed in SiC matric was proposed in this paper.Based on the finite element analysis software COMSOL,a three-dimensional thermal-fluid-solid coupling analysis model was established to initially realize the performance analysis of the fuel element and carry out experiments under different coolant flow flux.The results show that the higher the flow rate,the lower the maximum temperature of the fuel element,which is 1 340 K,1 250 K and 1 180 K respectively.The temperature is far lower than the melting point of SiC material and there is no risk of melting;the temperature distribution inside the hexagonal prism is relatively uniform,while the temperature distribution at the six corners of the hexagonal prism is relatively uneven.The maximum principal stress of the matrix appears around the coolant flow channel,with a maximum value of 95.6 MPa.The overall maximum principal stress at other locations is smaller,and the maximum principal stress is lower than the fracture strength of the SiC material.
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